diff options
| author | Jean Delvare <jdelvare@suse.de> | 2016-01-05 14:23:47 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-01-05 15:46:34 +0100 |
| commit | 166814d8413df49bf21293aacc808b2782cbd9a8 (patch) | |
| tree | 5eb75448791b058dbd5e3b8d01511fa76b4bf56a /drivers/gpio/gpio-pch.c | |
| parent | 446f59acb70b70a425ea4105277a71eb615327cd (diff) | |
| download | blackbird-op-linux-166814d8413df49bf21293aacc808b2782cbd9a8.tar.gz blackbird-op-linux-166814d8413df49bf21293aacc808b2782cbd9a8.zip | |
gpio: pch: Optimize pch_gpio_get()
The double negation is costly and can be avoided by shifting the
register value before masking the requested bit.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pch.c')
| -rw-r--r-- | drivers/gpio/gpio-pch.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c index 0475782a7e88..7c7135da5d4a 100644 --- a/drivers/gpio/gpio-pch.c +++ b/drivers/gpio/gpio-pch.c @@ -127,7 +127,7 @@ static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr) { struct pch_gpio *chip = gpiochip_get_data(gpio); - return !!(ioread32(&chip->reg->pi) & (1 << nr)); + return (ioread32(&chip->reg->pi) >> nr) & 1; } static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, |
